Bolt-cutter



(mmel') w. WOOLGAR.

BOLT CUTTER.

No. 459,620. Patented Sept. 15, 1891.

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UNITED STATES PATENT OFEICE.

\VILLIAM VVOOLGAR, OF EAST SAGINAXV, MICHIGAN.

BOLT-CUTTER.

SPECIFICATION forming part of Letters Patent No. 459,620, datedSeptember 15, 1891.

Application filed June 10, 1889. Serial No. 313,659. (No model.)

To all whom it may concern:

Be it known that I, ILLIAM lVOOLGAR, a citizen of the United States,residing at East Saginaw, in the county of Saginaw and State ofMichigan, have invented certain new and useful Improvement-s inBolt-Cutters; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form part of this specification.

My invention relates to devices for cutting 01f the ends ofcarriage-bolts, rivets, &C., and is designed, especially, as animprovement on the devices for which Letters Patent of the United StatesNo. 362,137 were granted to me on May 3, 1887 and it consists, chiefly,in the form and construction of the reciprocating knife and in thecombination and arrange ment of the several parts, which I hereinafterfully explain, and definitely point out in the claims.

The objects of my invention are to provide a means of supporting andretaining the knife in position when it is subjected to a heavy strainin cutting and to provide a machine for cutting the ends of bolts, rods,rivets, &c., that will be strong and durable and that may be cheaplyconstructed and repaired. I attain these objects by means of the devicesillustrated in the accompanying drawings, in which- Figure l isahorizontal longitudinal section of my improved machine, showing theknives meeting each other after the cutting operation. Fig. 2 is avertical section of the same. Fig. 3 is the same as Fig. 1, with thereciprocating knife drawn backward. Fig. 4 is a view in perspective ofthe improved knife. Fig. 5 is a front view of the same with section ofcasing at y y, Fig. 1. Fig. 6 is a section taken at w m, Fig. 1. v

a represents the casing or holder, and b is a longitudinal chamber, therear end of which is open, while the lateral side portions cl and e ofthe front end of the casing extend beyond the upper and lower portions 0and 0 thereof and are joined to an end portion f.

g is the shank of a fixed knife resting against the inner side of theend f, and his a knife portion extending rearwardly from the bottom ofthe shank, while dis a portion of the lower inner edge of the part f,extending rearwardly beneath the heel of the knife, which is cut awayand fitted to bear upon the projection, so that a support is giventhereby to the knife against a downward strain when cutting. Lugs g ofthe casing also serve to hold the stationary knife.

j is a block fitted to pass into the rear end of the chamber 1), and isprovided on its lateral sides with projecting teeth and is provided witha central longitudinal opening Z, and m is a knife-block provided on theupper portion of its lateral sides with longitudinal ribs 02, and themiddle portion of the front end is cut away to form the knife 0, havingits edge coincident with thelower side of the block, whilethe ribs orare left with the portions p extending beyond the edge of the knife. Theupper portions of the lateral sides of the chamber 1) are provided withgrooves q to receive the ribs n, and these grooves form theslides r,which are continued along theinner sides of the portions 61 and e, andthe block is placed in position with its rear end 3 resting against thefront end of the block 3', and is held in position by a bolt 75, passingthrough the opening Z, and with its front end tapped into theknife-block, while on the rear end, which projects beyond the block j,is a nut to, which holds the parts firmly together.

1) are levers with one end pivoted at w to the lateral sides of thecasing, the upper and lower portion of which projects outwardly toreceive the pivots, and the inner ends of the levers are provided withteeth a, which intermesh with the teeth 7t, so that when the levers arethrown apart the block j and knife 0 are drawn to the rear, as shown inFig. 3, and when the levers are moved toward each other the block andknife are propelled forward. As shown in Figs. 2 and 3, the inner endsof the levers o are provided with circular flanges Z), which projectover the 11 .per and lower sides of the block j and are prox ided ontheir peripheries with teeth 0, which intermesh with each other, so thatwhen one of the levers is moved in either direction the opposite leverwill also be given a corresponding movement in the opposite direction,which serves to retain the casing in a proper relative position to thelevers and avoids any liability of one lever moving in advance of theother.

It will be noticed that in order to cut bolts or rivets close to thesurface from which they protrude the knife-edges of the cutter must bearranged to lie in the plane of the lower surface of thesupporting-holder, and for cutting in various places and betweenprojections, &c., the holder which carries the knife must be of alimited width, and to conform with these conditions the chamber bisprovided on the lower edges of its lateral sides with the slides r,projecting inwardly, while the knife-block m is arranged with the ribsn, projecting outwardly from the upper edges? of its lateral sides, sothat the knife-edge 0 extends entirely across the space between theslides 7", while the portionsp of the ribs project forwardly, and,extending beyond the knife-edge 0, provide a bearing-surface ofsufficient area to form a permanent and substantial means of-retainingthe edge of the knife 0 against a downward strain, which obtains uponthe knife during the cutting operation on account of the knifebeing-beveled entirely upon its upper side, as must be the constructionthereof in order to cut the bolt or rivet close to the nut or fastening,and in this lies the gist of my invention, as the edge 0 by this meansis firmly held to its position and the wear of the slides is therebygreatly reduced and the strength of the device materially increased. 7

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. In combination, the casing having the stationary cutter and formed onits interior with slideways, a movable knife-block havinglaterally-projecting ribs along the upper portion of its sides, thelower and narrow part of the block being beveled at its front to formthe cutting-edge, and the arms projecting forward above and beyond thecutting-edge and forming integral continuations of the lateral ribs atthe top of the knife-block, and operating mechanism for the block,substantially as described.

2. In combination, the casing, the movable knife with operatingmechanism, the fixed knife having a bent or angular lower portion, andthe seatfor the knife consisting of the beveled lip on the casing, theend Wall, and the lugs also thereon, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM WOOLGAR.

Witnesses:

Ms. E. THOMAS, J. J DE lVIARS.

